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Common PHP Questions by Function

Below is a list of common functions used in the PHP and mySQL examples on this site. If you want to know about a particular function and see an example of that function in use rather than having a specific question, you will find this index a useful tool in quickly finding out a function. The majority have a clear and simple example of how to use a function so that you can get to grips and start using a function quickly whatever your knowledge of PHP.

addslashes
How do I escape a string with slashes?
How do I escape data that is going into a database?


array_count_values
How do I count the number of times a value appears in an array?


array_flip
I want to invert my array, can I do this?


array_keys
I am not interested in the values in the arrays, how can I discard them?


array_multisort
How can I sort a multi-dimensional array?


array_pop
How do I remove and view the last element of an array?


array_push
How do I add to the end of an array and know how large the array is?


array_rand
How do I pick a random value from an array?


array_reverse
How do I reverse the order of the elements in an array?


array_shift
How do I remove the first element from an array?


array_unique
How do you remove duplicate values from an array?
How do we sort an array of names taken from a text file, displaying only unique names?


array_unshift
How do I add to the beginning of an array and find the number of elements in it?


array_values
How do I return all the values in an array?


arsort
How can I reverse sort an array keeping the correlation between the index and value?


asort
How can I sort an array keeping the correlation between the index and value?


ceil
How do I round up a number?


checkdate
How do I check if a date entered exists?


chop
How can I remove trailing space from a string?


count and sizeof
How do I find the size of an array?


ctype_alpha
How can I check that a data value is alphanumeric?


CURDATE
How do I insert the date into my table?


date
How do I display todays date on my website?


echo
How do I print text to the screen?


empty
How do I check for an empty field in a form?


ereg
How do I check that a valid email address is entered?


explode
How do I break email address into username and hostname?
How do I count the number of words in my text?
How do I turn a string into an array?


file
What is the use of file in php?


floor
How do I round down a number?


fopen
How do I open a file to write content to?


foreach
How can I loop through the members of an array?
How can I display values in a two dimensional array?


getdate
How do you get an array of the date and time?


GetHostByName
How to find a domain name for an IP address?


get_magic_quotes_gpc
How do I know if magic quotes is switched on?


global
How do I make a variable from outside a function work in that function?


header
How do I send HTTP headers with PHP?
How do I perform a 301 redirect with PHP?


Htmlentities
How do I convert relevant characters in a string to HTML entities?


imagecolorat
How can I find the colour of a pixel of an image?


imagerotate
How can I rotate an image?


imagesx and imagesy
How can I find the width and height of an image resource?


imagettftext
How can I add text to an image?


implode
How do I turn an array into a string?


include
How do I keep my site menu in one file?


int
How do I force a value to be treated as a number?


in_array
How can I check if a value is already in an array?
How do I find out if a value is already in an array?


isset
How do you check if a variable is set or not in PHP?


is_array
How do I check if a variable is of array type?


is_numeric
How can I check a value entered in a field on my form is a number?


krsort
How do I reverse sort an array by key?


ksort
How do I sort an array by key?


LENGTH
How do I find the longest value in my mysql table?


mail
How do I email the contents of a form to me?
is there any sendemail function in php for sending contents of a form through email?


metaphone
How do I calculate the metaphone of a string?


mktime
How do I find the timestamp for a particular date?


mysql_affected_rows
How do I find the number of rows affected by a query?


mysql_insert_id
How do I find the ID of a new row added to a table?


mysql_num_rows
How do I find the number of rows in a result set?


mysql_result
How do I find second highest value from a table?


natsort
How do I sort alphanumeric array data correctly?


nl2br
How do I convert newlines to HTML line break tags?
How do I display newline characters on a webpage?


number_format
How do I format a number with commas like a monetary value?


ord
How do I find the ASCII value of a string character?


parse_str
How do I extract the values of variables from a string?


phpinfo
How do I find out about my PHP installation?


print and echo
What is the difference between print and echo?


printf
How do I format the output of a string?


print_r and var_dump
How can I easily view all members of an array?


rand
How do I generate a random number?


range
How can I create an array of the letters of the alphabet?
How can I create an array of numbers easily?


require
How do I make sure an include file exists before loading the page?


reset
How can I reset an array in PHP?


return
How do I return a value from a function?


rsort
How do I reverse sort the members of an array?


rtrim
How do I remove trailing whitespace from a string?


set_time_limit
How can I stop my PHP script timing out?


shuffle
How can I mix up the order of values in an array?


sort
How do I sort the members of an array by value?


static
How do I get a variable in a function to retain its value between calls?


stripslashes
How do I remove escape characters from data?
I retrieve data from a Mysql database and insert it into a textfield form. The data that I retrieve have a / at the end of the string. The data in the database does not have this / in the data. How do I remove this /?


strip_tags
How do I remove HTML tags from a string?
How do I check if a string contains HTML?


strlen
How do I find the length of a string in PHP?


strpos
How do I find the position of a letter in a string in PHP?


strrev
How do I reverse a string in PHP?


strrpos
How do I find the last occurrence of a character in a string?


strtolower
How do I make the contents of a string lower case?


strtoupper
How do I make the contents of a string upper case?


str_pad
How do I make sure a string is a certain length?


str_repeat
How can I repeat a string variable several times?


str_replace
How do I replace a word in a string in PHP?


substr_count
How do we count paragraphs or newlines?


trim
How can I remove spaces from around a string value?


ucfirst
How do I make the first letter of a string uppercase?


ucwords
How do I make the first letter of each word upper case?


unset
How do I remove an element from an array without changing the index values for the rest of the array?


usort
How do I write my own sort function?


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